Suborder:
|
Goniatitina
|
Superfamily:
|
Pericycloidea
|
Family:
|
Pericyclidae
|
Subfamily:
|
Pericyclinae
|
Genus:
|
Nematocyclus |
Qualifier:
|
gy |
Author:
|
Gordon 1986,p.28
|
Valid:
|
Goniocyclus Gordon 1986 |
Lower Boundary:
|
UNM Caballero Fm. base, 357.5 million years
|
Upper Boundary:
|
UNM Caballero Fm. top, 353 million years
|